GB2240037A - A pressure relieving aid - Google Patents

Abstract

A pressure relieving aid is in the form of a container (1) of a flexible plastics material. The perimeter of the container (1) is radio frequency welded and the interior of the container is divided into two compartments (2, 3) by means of a central barrier weld (5). A gap (6) is provided between the end of the barrier weld (5) and the adjacent perimeter (4) of the container. The communicating compartments (2, 3) are filled with a mixture of a gelling agent which provides a partly compressible gel solution. The gap (6) enables the gel solution to be displaced in a controlled manner between the compartments in the container (1) when an external pressure is applied thereto. <IMAGE>

Description

A PRESSURE RELIEVING AID This invention relates to a pressure relieving aid.

A pressure sore on the human body is a problem which costs the care/health services millions of pounds annually. There are many products already known which claim to prevent or reduce the risk of pressure sores and these fall into two categories.

1. Prevention by passive support.

2. Prevention by dynamic support (i.e. mechanical movement).

In both cases, the objective of the pressure relieving product is to ensure that any part of the body which is in contact with the surface beneath it (this surface contact is defined as the interface pressure) is supported by a medium which will absorb as much pressure as possible and at the same time vary that pressure cyclically at least once in every fifteen minutes to a level which is below 35mm Hg. The pressure level of 35mm Hg is the approximate interface pressure which equates to the cut off point of the IMPROVEMENTS IN OR RELATING TO DISCHARGE OF MATERIAL FROM FLEXIBLE CONTAINERS.

The present invention relates to a method of discharging material from an at least partially flexible container and to flexible container discharge apparatus.

It is known to suspend flexible bags containing material with the bottom of these bags being supported on a rigid platform. Material is discharged through a nozzle extending down from the bottom of the bag and, in order to assist in the discharge, the platform is vibrated. However, the vibration of the platform is only of limited use in attempting to break up the material in the bag and prevent the formation of any bridges above the outlet, and the vibration does not necessarily work on all types or consistencies of material. Furthermore the machinery may suffer wear and fatigue as a result of the repeated vibrations, and the vibrating mechanism requires repeated maintenance.

According to one aspect of the present invention a method of discharging material from an at least partially flexible container comprises changing the shape of the container and thereby causing movement of material within the container.

The method may comprise changing the shape at a plurality of locations.

The method may comprise changing the shape of a downwardly facing portion of the container.

The method may comprise pushing a wall of the container inwardly and, alternatively or additionally, FLUOROANILINES This invention relates to a process for the preparation of a fluoroaniline by simultaneous reduction and ring fluorination (reductive fluorination) of the corresponding nitrobenzene.

According to the present invention there is provided a process for the preparation of a compound of Formula A:

Formula A which comprises reductive fluorination of a compound of Formula B:

F o r m u I a B wherein X and X are independently selected from II or any substituent which does not interfere with the reductive fluorination; and Z and Z are each independently selected from H or an electron donating group.

ROLLER-SHUTTER ASSEMBLY The present invention relates in general to roller shutters.

Known roller shutters are either installed as a unit fixed on an existing building or installed in situ. A unit employs a single box-like housing containing the rolled-up shutter disposed over a window or door opening.

The shutter is then rolled down to protect the window or door. Despite efforts to style the appearance of the roller shutter housing this tends to be visually unattractive. Furthermore certain roller shutter units are vulnerable to tampering and do not provide burglar proof protection.

A general object of the present invention is to provide an improved roller-shutter assembly.

According to the invention there is provided a roller-shutter assembly for installation beneath a support or load-bearing lintel above a door or window opening of a building; said assembly comprising an elongate housing for containing a roller-shutter which can be raised and lowered via a slot or opening in a base wall of the housing, a removable panel or the like for permitting access to the roller-shutter from the interior GEROTOR PUMPS This invention relates to gerotor pumps, which have a male lobed rotor with n teeth located in a female lobed rotor with n+l teeth so as to provide a set of pumping chambers between the lobes. The rotors and chambers rotate and in so doing the chambers increase and decrease in size to perform induction and expression of pumped fluid.

The chambers are each bounded in the circumferential direction by two lines of contact between rotor and annulus. At axial ends the chambers are bounded by the pump body, which most usually includes a cylindrical cavity housing the gerotor set, so that the base of the cavity provides one axial end wall for the chambers, and a cover plate for the body provides the opposite end wall.

Pumping efficiency depends primarily upon chamber sealing, and one of the most critical areas available for control is that of axial clearance between the parts.

The manufacturing methods used for the gerotor set frequently involve compaction and sintering of powdered metals for reasons which will be understood by the production engineer, and this is followed by machining of the axial faces of the gerotor parts in order to provide the required smoothness of finish to those end faces which are to rub on the body and cover plate.

There is a dilemma for the pump manufacturer in that particularly narrow manufacturing tolerances are needed for the body cavity axial length and for the gerotor parts axial length in order to achieve high efficiency.

This is done, in convention production engineering, by setting acceptable standards, gauging all components and rejecting those outside the preset limits. This is inevitably expensive because of the unavoidable rejection rate, and particularly so with powdered metal compacts which sometimes require to be machined more or less acrylic, phenolic or polyester-based resin or bitumen and may preferable also have fire retardant properties.

Once the resin has been charged into the reservoir to the predetermined level, the method may include heat shrinking the finger portions of the beakout in position about the cores of the cable.

The sleeve, the phase insulators and the breakout may all be of polyolefin material. Further, the phase insulators and the break-out may also be of an antitracking material.

The invention is now defined by way of example with reference to the accompanying diagrammatic drawings.

In the drawings.

Figures 1 to 6 show, schematically, sectional axial views of a cable in various stages in the formation of a cable termination, in accordance with the invention.

Referring to the drawings, a paper insulated lead sheathed cable 10 has its insulation 12 stripped therefrom to reveal current carrying cores 14 of the cable 10. The region in which the cores protrude from the lead sheathing insulation 12 of the cable 10 is referred to as the "crotch" region 16 and shall be referred to as such hereinafter.

A method of terminating the cable 10 in accordance with the invention included the initial step of placing a phase insulator in the form of a tube 18 of a polyolefin, anti-tracking, heat shrink material about each core 14. The tubes 18 are then heat shrunk about the cores 14 as illustrated in Figure 2 of the drawings.

To form a reservoir 20 about the crotch region 16 of the cable 10, a rigid tubular element 22 is mounted over the crotch region 16 of the cable 10 so that the tubular element 22 extends partially over the cable 10 and partially over the exposed cores 14 of the cable 10.

A sleeve 24 of a polyolefin, heat shrink material is placed about an outer surface of the rigid

Claims (1)

1. drawing a loop of prepared material through the passage to extend from both faces of the stack, cutting the loop at a preselected distance from one face of the stack to form two independent pieces of prepared material, and folding back the end portions of each piece onto the opposite faces of the stack to extend away from the other piece.

   8. A method as claimed in claim 7 wherein the length of the loop and the said preselected distance are arranged so that the two independent pieces each project an equal distance from opposite faces of the stack.

   9. A method as claimed in claim 7 or claim 8, further including placing at least one additional layer of intermediate fabric material over the folded back end portions on each face of the stack.

   10. A method as claimed in any one of claims 7 to 9 further including repeating said operations at required spaced locations from one another.

   11. A method as claimed in any one of claims 7 to 10 further including curing the fastened layers.

   12. Apparatus as claimed in claim 1 substantially as herein described and shown the in the accompanying drawings.

   13. A method as claimed in claim 7 substantially as herein described with reference to the accompanying drawings.